As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED ON LOG THAT THE LAVATORY SMOKE DETECTOR FLICKERED INTERMITTENTLY. MX CREW INSPECTED SMOKE DETECTOR FOUND OIL ODOR TO BE COMING FROM APU WHILE RUNNING BLEEDS. APU WAS PLACED ON THE MEL LIST AND NO OTHER DEFECTS WERE NOTED.